Data for “Deep Nitrogen Fluxes and Sources Constrained by Arc Lava Phenocrysts"

Deep Nitrogen Fluxes and Sources Constrained by Arc Lava Phenocrysts
Submitted to Geophysical Research Letters

Authors: 
Michael R Hudak(1,2), Peter H Barry(2), David V Bekaert(2,3), Stephen J Turner(4,5), Michael W. Broadley(2,6), Kristina Walowski(7), Rebecca L Tyne(2,6), Kan Li(2), Sune G Nielsen(3,8), Joshua M Curtice(2), Mark D. Kurz(2), Emily Cahoon(9), Paul Wallace(10), Michelle Muth(11), Alison M Shaw(12)

Affiliations:
1 Geosciences Dept, Williams College, Williamstown, MA 01267
2 Marine Chemistry and Geochemistry Dept, Woods Hole Oceanographic Institution, Woods Hole, MA 02543
3 Centre National de la Recherche Scientifique, Centre de Recherches Pétrographiques et Géochimiques, Université de Lorraine, Nancy, France
4 Dept of Earth, Geographical, and Climate Sciences, University of Massachusetts Amherst, Amherst, MA 01003
5 Dept of Earth and Atmospheric Science, University of Houston, Houston, TX 77204
6 Dept of Earth and Environmental Science, University of Manchester, Manchester, United Kingdom
7 Geology Dept, Western Washington University, Bellingham, WA 98225
8 Geology and Geophysics Dept, Woods Hole Oceanographic Institution, Woods Hole, MA 02543
9 College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331
10 Dept of Earth Sciences, University of Oregon, Eugene, OR 97403
11 Dept of Earth and Space Sciences, University of Washington, Seattle, WA 98195
12 Lorax Environmental Services Ltd, Vancouver, Canada
Corresponding author: Michael R. Hudak (mrh8@williams.edu)  


Description: These data correspond to the article “Deep Nitrogen Fluxes and Sources Constrained by Arc Lava Phenocrysts” by Hudak et al. submitted to Geophysical Research Letters. Table S1 includes N-He-Ar data for FIs in phenocrysts from mafic are lavas and tephras. Table S2 contains the corrected N2/3He data used for volcanic arc N flux calculations and the arc-averaged mean N arc flux. Table S3 summarizes previous literature estimates of N fluxes and the data used for those calculations. Table S4 provides the N concentrations, He concentrations, N isotope compositions of the mantle, sediments, and altered oceanic crust, as well as sediment thicknesses. Finally, Table S5 gives information about the sources of the mineral separates used for these analyses.


Data files and captions:
Table_S1.csv
Table S1. N-He-Ne-Ar data for olivine- and pyroxene-hosted fluid inclusions.

Table_S2.csv
Table S2. Flux calculations from the degassing corrected N2/3He(4/40) fluid inclusion data. The mean of each arc segment is taken. Global arc 3He fluxes of 73.9 mol/yr (Bekaert et al., 2021) are well constrained are used to calculate N2 fluxes. These are then doubled to obtain the flux of N in mol/yr. *Indicates the minimum N2/3He value possible using the 4He/40Ar* degassing correction.

Table_S3.csv
Table S3. Previous flux estimates from the literature. Sano et al. (2001) produce their arc N outflux by taking their air-corrected N2/3He and the estimated annual arc 3He outflux from Torgersen (1989). Hilton et al. (2002) and Fischer et al. (2008) calculate arc N outfluxes from N2/SO2 ratios of volcanic gases and arc S outfluxes. Kagoshima et al. (2015) provides an arc S outflux and a characteristic S/3He ratio for arcs and is in reasonable agreement with Hilton et al. (2001) and the preferred ratio of arc outfluxes compiled from the literature by Bekaert et al. (2021).

Table_S4.csv
Table S4. N and He endmembers in Fig. 4 mixing model taken from the literature.							
(a) Bekaert et al. (2021): N and He concentrations for global sediment, DMM, and AOC are converted from mol/g, and global sediment and AOC thicknesses and densities; Slab components (sediment and AOC) are treated as having no He as He is not recycled during subduction.							
(b) Cartigny and Marty et al. (2021): δ15N of global sediment and DMM.							
(c) Busigny et al. (2005)
(d) Li et al. (2007); 
(e) Busigny et al. (2019); 
(f) Li et al. (2022); 
(g) Li and Li (2023): AOC δ15N is highly variable, but averages between -2.9‰ and +3.0‰ in these studies (c-g), so we use 0‰ as a global average value.
(h) Plank (2014): Subduction zone-specific sediment thicknesses and H2O-corrected densities.
(i) Hebbeln et al. (2000); 
(j) Martinez et al. (2006); 
(k) Robinson et al. (2007): Chilean sediment mean N concentrations and  δ15N (i-k).
(l) Lyle, (1997): Cascadia mean N concentrations from IODP Site 1020 sediment core.
(m) Li and Bebout (2005): Central American mean sediment N concentrations and δ15N.
(n) Sadofsky and Bebout (2004): Marianas mean sediment N concentrations and δ15N.

Table_S5.csv
Table S5. Sample locations and notes. Chilean samples are collected by Dave Hilton in 1989 and approximate GPS locations were determined by field notes. The other samples were collected by the authors. 


Date of data collection: 2022-02 to 2022-12
Sample locations and information are given in Table S4.

Data collection methods are described and referenced in text.